#include <REGX52.H>

void Delay1ms(unsigned int xms)		//@12.000MHz
{
	unsigned char i, j;

	i = 12;
	j = 169;
	do
	{
		while (--j);
	} while (--i);
	xms--;
}


void main()
{
	while(1){
		if(P3_1==0){
			Delay1ms(20);
			while(P3_1==0);
			Delay1ms(20);
			
			P2_0 = ~P2_0;
		}
	}
}